ElvUI doesn't really have any CD tracker except for actionbars. Built-in classtimer tracks buffs and debuffs both on player and target.
Most of the time a standalone addon, unless a skin is included with ElvUI itself, need some lua editing. Fortunately, ElvUI has quite a big community which tries to skin popular addons so you rarely need do to it by yourself.
You should check
Skinning and
Addons forums. There are plenty of skinned addons and addons made by community.
There's actually a skinned version of
ForteXorcist.